Device for detecting air tightness of flowmeter process pipeline

Abstract

The utility model discloses flow meter process pipeline airtightness detection equipment, which comprises a tank body, a first gas conveying pipe, a second gas conveying pipe, a first detection device and a second detection device, and is characterized in that the tank body is used for storing compressed gas; one end of the first gas delivery pipe is connected with the tank body, the other end is used for inputting compressed gas, and the first gas delivery pipe is provided with a first valve body which can open the first gas delivery pipe; one end of the second gas delivery pipe is connected with the tank body, the other end is connected with a to-be-tested process pipeline, and the second gas delivery pipe is provided with a second valve body which can open the second gas delivery pipe; the first detection device is arranged on the tank body and is used for detecting the gas pressure in the tank body; and the second detection device is arranged on the to-be-detected process pipeline and is used for comparing with the first detection device so as to detect the air tightness of the to-be-detected process pipeline. According to the technical scheme of the utility model, the convenience and the accuracy of the air tightness detection of the process pipeline can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air tightness detection, in particular to an air tightness detection device for a flow meter process pipeline. Background Art

[0002] In the fine chemical manufacturing industry, positive displacement or mass flowmeters are used to measure the flow rate of fluids within pipelines. When measuring fluids within closed pipelines, the pipeline must remain full, especially after passing through the flowmeter, to ensure accurate measurement. If the pipeline is not full, the volume of the voids in this portion of the fluid after measurement by the flowmeter is uncertain, resulting in measurement errors.

[0003] In the existing flow meter process pipeline, the flow meter is installed in the main line, and the main line is located at the rear end of the flow meter and is connected to multiple branch pipelines. If the valve on the branch pipeline leaks due to damage to the sealing ring inside the valve, it will cause the volume or quality of the fluid in the pipe to change, resulting in measurement errors. At the same time, due to the small amount of internal leakage, if the impact on process manufacturing and product quality is small, it is not easy to discover the problem. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a device for detecting the air tightness of a flow meter process pipeline, which can improve the convenience and accuracy of the process pipeline air tightness detection.

[0005] According to the first embodiment of the present invention, a device for detecting the air tightness of a flow meter process pipeline includes:

[0006] Tanks, used to store compressed gas;

[0007] a first gas pipeline, one end of which is connected to the tank body and the other end of which is used to input compressed gas, the first gas pipeline being provided with a first valve body capable of opening the first gas pipeline;

[0008] a second gas pipe, one end of which is connected to the tank body and the other end of which is used to connect to the process pipeline to be tested; the second gas pipe is provided with a second valve body, and the second valve body is capable of opening the second gas pipe;

[0009] a first detection device, provided in the tank body and used for detecting the gas pressure in the tank body;

[0010] The second detection device is provided on the process pipeline to be tested and is used for comparison with the first detection device to detect the air tightness of the process pipeline to be tested.

[0011] The device for detecting the air tightness of the process pipeline of a flow meter according to the embodiment of the present utility model has at least the following beneficial effects: the two ends of the tank body are respectively connected to the first gas pipe and the second gas pipe, the tank body is provided with a first detection device, and the device also includes a second detection device for being installed on the process pipeline to be tested. When the device is in use, the second gas pipe is connected to the process pipeline to be tested, the first valve body is opened and the second valve body is closed, and compressed gas is input into the tank body to detect the sealing of the tank body. When the pressure value of the first detection device stabilizes and remains unchanged, it proves that the sealing of the tank body is good, and the next step is performed, the first valve body and the second valve body are opened, and compressed gas is input to make the pressure of the first detection device and the second detection device equal, and then the first valve body of the first gas pipe and the second valve body of the second gas pipe are closed, and the process is left to stand for a period of time. If the pressure value of the second detection device remains unchanged, it proves that there is no leakage in the process pipeline to be tested, and vice versa.

[0012] According to some embodiments of the present invention, the tank body is provided with a third valve body, and the third valve body is used to discharge the fluid in the tank body.

[0013] According to some embodiments of the present invention, the second gas pipeline is provided with a fourth valve body, and the fourth valve body is used to prevent the fluid in the process pipeline to be tested from flowing back to the second gas pipeline.

[0014] According to some embodiments of the present invention, the fourth valve body is configured as a check valve.

[0015] According to some embodiments of the present invention, the first valve body and the second valve body are both configured as pneumatic ball valves.

[0016] According to some embodiments of the present invention, the tank body is configured as a seamless steel pipe with both ends sealed with pipe caps, and the pressure resistance grade of the seamless steel pipe is 1 MPa.

[0017] According to some embodiments of the present invention, the seamless steel pipe has a diameter of 250 mm and a length of 400 mm.

[0018] According to some embodiments of the present invention, one end of the first gas pipeline is connected to a gas compressor, and the gas compressor is capable of inputting compressed nitrogen with a pressure less than 0.6 MPa into the tank.

[0019] According to some embodiments of the present invention, the first detection device and the second detection device are both configured as pressure gauges with a pressure range less than or equal to 1 MPa.

[0020] According to some embodiments of the present invention, both the first detection device and the second detection device are configured as pressure gauges with a signal remote transmission function.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram of a device for detecting air tightness of a flow meter process pipeline according to an embodiment of the present utility model;

[0024] Figure 2 This is a schematic diagram of an apparatus for detecting air tightness of a flow meter process pipeline and a process pipeline to be tested according to an embodiment of the present invention.

[0025] Reference numerals:

[0026] Tank body 1, first gas pipe 2, second gas pipe 3, first detection device 4, second detection device 5, first valve body 6, second valve body 7, third valve body 8, fourth valve body 9, centrifugal pump 10, W1 valve body 11, A pipeline 12, A1 valve body 13, flow meter 14, BC1 valve body 15, B pipeline 16, B1 valve body 17, B2 valve body 18, B3 valve body 19, C pipeline 20, C valve body 21, RC reactor 22, D pipeline 23, D valve body 24, RD reactor 25, E pipeline 26, E valve body 27, RE reactor 28. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of this utility model, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. If the term "first" or "second" is used in a description, it is only used to distinguish technical features and should not be understood to indicate or imply relative importance, implicitly specify the number of the indicated technical features, or implicitly specify the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] In the fine chemical manufacturing industry, positive displacement or mass flowmeters are used to measure the flow rate of fluids within pipelines. When measuring fluids within closed pipelines, the pipeline must remain full, especially after passing through the flowmeter, to ensure accurate measurement. If the pipeline is not full, the volume of the voids in this portion of the fluid after measurement by the flowmeter is uncertain, resulting in measurement errors.

[0032] In the existing flow meter process pipeline, the flow meter is installed in the main line, and the main line is located at the rear end of the flow meter and is connected to multiple branch pipelines. If the valve on the branch pipeline leaks due to damage to the sealing ring inside the valve, it will cause the volume or quality of the fluid in the pipe to change, resulting in measurement errors. At the same time, due to the small amount of internal leakage, if the impact on process manufacturing and product quality is small, it is not easy to discover the problem.

[0033] In response to the above technical problems, an embodiment of the present utility model proposes a device for detecting the air tightness of a flow meter process pipeline, which can detect the air tightness of the process pipeline online, find out the valves with internal leakage in the process pipeline, and replace them quickly with convenient operation, thereby improving the measurement accuracy of the flow meter in the process pipeline and reducing the measurement error.

[0034] The following is combined with Figure 1 and Figure 2 The invention describes an embodiment of a device for detecting the air tightness of a flow meter process pipeline.

[0035] Reference Figure 1 and Figure 2As shown, in an embodiment of the utility model, the equipment for detecting the air tightness of the flow meter process pipeline includes a tank body 1, a first gas pipe 2, a second gas pipe 3, a first detection device 4 and a second detection device 5. The first gas pipe 2 and the second gas pipe 3 are both connected to the tank body 1, and the end of the first gas pipe 2 away from the tank body 1 is used to connect to the gas compressor, and the end of the second gas pipe 3 away from the tank body 1 is used to connect to the process pipeline provided with the flow meter. The first detection device 4 is provided on the tank body 1 and is located at the top of the tank body 1. The second detection device 5 is used to be installed on the process pipeline to be tested, and its detection results are used to be compared with the detection results of the first detection device 4 to draw a conclusion on the air tightness of the process pipeline to be tested.

[0036] It should be noted that in this embodiment of the present invention, the connection point between the first gas pipe 2 and the tank body 1 is located at the top of the tank body 1, close to the end face of the tank body 1. This allows the compressed gas input from the first gas pipe 2 to fill the tank body 1 from one side to the other, effectively removing air. The first gas pipe 2 is provided with a first valve body 6, which controls whether the first gas pipe 2 is connected or closed. The first valve body 6 can be configured as a pneumatic ball valve or a manual ball valve.

[0037] It should be noted that in this embodiment of the present invention, the connection between the second gas pipe 3 and the tank body 1 is located at the top of the tank body 1. This allows the air within the tank body 1 to be discharged from one side to the other, improving discharge efficiency and reducing the mixing of compressed gas and air. The second gas pipe 3 is provided with a second valve body 7, which controls whether the second gas pipe 3 is connected or closed. The second valve body 7 can be configured as a pneumatic ball valve or a manual ball valve.

[0038] It should be noted that the first detection device 4 and the second detection device 5 are both configured as pressure gauges with signal remote transmission function, which is convenient for remote operation, and the pressure range of the pressure gauge is less than or equal to 1MPa, which meets the process requirements for process pipeline air tightness detection.

[0039] It should be noted that, in the embodiment of the present utility model, the tank body 1 is configured as a seamless steel pipe with caps at both ends for sealing, and the pressure rating of the seamless steel pipe is 1 MPa. The diameter of the seamless steel pipe is 250 mm and the length is 400 mm, which is small in size and convenient for carrying, installation and disassembly. One end of the first gas pipe 2 is connected to a gas compressor, which can input compressed gas with a pressure of less than 0.6 MPa into the tank body 1. The pressure of the compressed gas input by the gas compressor to the tank body 1 is less than the pressure rating of the tank body 1, which is beneficial to extend the service life of the equipment and reduce the failure rate of the equipment.

[0040] It is understood that in some embodiments of the present invention, the tank body 1 can be integrally formed of a metal material, and its size can also be set according to actual production requirements. For example, the tank body 1 can be integrally formed of a stainless steel material, with a diameter of 300 mm and a length of 500 mm.

[0041] In addition, in this embodiment of the present invention, a third valve body 8 is provided at the bottom of the tank body 1. The third valve body 8 is used to discharge the fluid in the tank body 1. The third valve body 8 is configured as a drain valve. When it is necessary to discharge the compressed gas in the tank body 1 or when liquid is backflowing from the process pipeline into the tank body 1, the third valve body 8 is opened to discharge the fluid in the tank body 1.

[0042] It should be noted that in this embodiment of the present invention, to prevent the fluid in the process pipeline to be tested from flowing back into the tank body 1, the second gas pipeline 3 is further provided with a fourth valve body 9, which is configured as a check valve. The fourth valve body 9 is located on the side of the second valve body 7 away from the tank body 1 and is close to the process pipeline to be tested.

[0043] Reference Figure 2 As shown, in the embodiment of the present invention, the process pipeline to be tested includes pipeline A 12, pipeline B 16, pipeline C 20, pipeline D 23, and pipeline E 26. Flowmeter 14 is disposed between pipeline A 12 and pipeline B 16. Pipeline A 12 and pipeline B 16 are connected. Pipeline C 20, pipeline D 23, and pipeline E 26 are all branches connected after pipeline B 16. The process pipeline to be tested is provided with multiple valve bodies and multiple reactors or dilution reactors.

[0044] Among them, the centrifugal pump 10 is arranged at the inlet end of pipeline A 12, and a W1 valve body 11 is installed between the centrifugal pump 10 and pipeline A 12. An A1 valve body 13 is installed between pipeline A 12 and flowmeter 14. A BC1 valve body 15 is installed between flowmeter 14 and pipeline B 16. The second gas pipeline 3 of the flowmeter process pipeline air tightness detection device of the present invention is connected between BC1 valve body 15 and pipeline B 16. A B1 valve body 17 is installed between pipeline B 16 and pipeline C 20. A B2 valve body 18 is installed between pipeline B 16 and pipeline D 23. A B3 valve body 19 is installed between pipeline B 16 and pipeline E 26. Pipeline C 20 is connected to multiple RC reactors 22, and multiple RC reactors 22 are connected in parallel. A C valve body 21 is installed between pipeline C 20 and each RC reactor 22. The D pipeline 23 is connected to multiple RD reactors 25, which are connected in parallel. A D valve 24 is installed between the D pipeline 23 and each RD reactor 25. The E pipeline 26 is connected to multiple RE reactors 28, which are connected in parallel. An E valve 27 is installed between the E pipeline 26 and each RE reactor 28. Furthermore, in other embodiments, the reactors can be replaced with dilution kettles according to actual production needs.

[0045] The operating principle of the flow meter process pipeline air tightness detection equipment applied to the process pipeline to be tested is as follows:

[0046] Check the sealing of the tank body 1: close the second valve body 7 of the tank body 1, open the first valve body 6 of the tank body 1, and use the gas compressor to fill nitrogen into the tank body 1 until the pressure of the first detection device 4 shows 0.6MPa. If it is maintained for 30 minutes and the pressure of the first detection device 4 does not change, it is considered that the sealing of the tank body 1 is normal.

[0047] Check the sealing of pipeline A 12 and pipeline B 16: Close the W1 valve body 11, close the B1 valve body 17, close the B2 valve body 18 and the B3 valve body 19, open the second valve body 7, and close the second valve body 7 when the pressure of the first detection device 4 and the second detection device 5 are consistent. If there is no change in the pressure of the second detection device 5 after standing for 30 minutes, it is considered that there is no leakage in pipeline A 12 and pipeline B 16. If a leak is found during the joint inspection of pipeline A 12 and pipeline B 16, close the A1 valve body 13 and the BC1 valve body 15, open the second valve body 7, and close the second valve body 7 when the pressure of the first detection device 4 and the second detection device 5 are consistent. If the pressure of the second detection device 5 decreases after standing for 30 minutes, it is considered that there is a leak in pipeline B 16, and the leaking valve body in pipeline B 16 needs to be replaced. Otherwise, it is considered that there is a leak in pipeline A 12, and the leaking valve body in pipeline A 12 needs to be replaced.

[0048] Check the sealing of pipeline C 20: After confirming that there is no leakage in pipeline B 16, close valve body A1 13 and valve body BC1 15, close valve body B2 18 and valve body B3 19, and open valve body B1 17. Check that valve body C 21 at the end of pipeline C 20 is open. Open the first valve body 6 to raise the pressure of the nitrogen tank to 0.6 MPa and then close the first valve body 6. Open the second valve body 7 and close the second valve body 7 when the pressure of the second detection device 5 is consistent with that of the first detection device 4. It should be noted that valve body C 21 generally remains in the normally open state and rarely moves, so the probability of internal leakage is relatively small. Let it stand for 60 minutes to observe whether the pressure of the second detection device 5 is consistent with that of the first detection device 4. If they are consistent, it means that there is no internal leakage in valve body C 21 of pipeline C 20.

[0049] The sealing inspection operation of pipeline D 23 and pipeline E 26 is based on the same principle as that of pipeline C 20 and will not be described in detail here.

[0050] It should be noted that when a leak occurs in pipeline C 20, the method for locating an internally leaking valve body is as follows: After pressurizing pipeline C 20 and allowing it to stand for 60 minutes, if the pressure in the second detection device 5 is observed to be lower than the pressure in the first detection device 4, it is considered that there is an internal leak in pipeline C 20. To further locate the specific valve body where the leak occurs, multiple C valve bodies 21 are pneumatic ball valves C1, C2, C3, C4, and C5. Close the C1, C2, C3, and C4 valve bodies, and the C5 pneumatic ball valve, and allow them to stand for 60 minutes to observe changes in the second detection device 5. If no changes occur, the C5 pneumatic ball valve is not leaking. Close the C1, C2, and C3 pneumatic ball valves again, and allow them to stand for 60 minutes to observe changes in the second detection device 5. If no changes occur, the C4 and C5 pneumatic ball valves are not leaking. This method is used to locate internally leaking pneumatic ball valves. After finding and replacing the internal leaking ball valve, test it again in the above manner. If the pressure of the second detection device 5 is equal to the pressure of the first detection device 4 after standing for 60 minutes, it proves that the internal leaking valve has been eliminated.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A device for detecting the air tightness of a flow meter process pipeline, characterized in that: include: Tanks, used to store compressed gas; a first gas pipeline, one end of which is connected to the tank body and the other end of which is used to input compressed gas, the first gas pipeline being provided with a first valve body capable of opening the first gas pipeline; a second gas pipe, one end of which is connected to the tank body and the other end of which is used to connect to the process pipeline to be tested; the second gas pipe is provided with a second valve body, and the second valve body is capable of opening the second gas pipe; a first detection device, provided in the tank body and used for detecting the gas pressure in the tank body; The second detection device is provided on the process pipeline to be tested and is used for comparison with the first detection device to detect the air tightness of the process pipeline to be tested.

2. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: The tank body is provided with a third valve body, and the third valve body is used to discharge the fluid in the tank body.

3. The air tightness detection device for flow meter process pipeline according to claim 1, characterized in that: The second gas pipeline is provided with a fourth valve body, and the fourth valve body is used to prevent the fluid in the process pipeline to be tested from flowing back to the second gas pipeline.

4. The device for detecting air tightness of a flow meter process pipeline according to claim 3, characterized in that: The fourth valve body is configured as a check valve.

5. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: The first valve body and the second valve body are both configured as pneumatic ball valves.

6. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: The tank body is configured as a seamless steel pipe with both ends sealed with pipe caps, and the pressure resistance grade of the seamless steel pipe is 1 MPa.

7. The device for detecting air tightness of a flow meter process pipeline according to claim 6, characterized in that: The seamless steel pipe has a diameter of 250 mm and a length of 400 mm.

8. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: One end of the first gas pipeline is connected to a gas compressor, and the gas compressor can input compressed nitrogen with a pressure less than 0.6 MPa into the tank.

9. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: The first detection device and the second detection device are both configured as pressure gauges with a pressure range less than or equal to 1 MPa.

10. The device for detecting air tightness of a flow meter process pipeline according to claim 1, characterized in that: The first detection device and the second detection device are both configured as pressure gauges with a signal remote transmission function.

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